Fix most of #31307: cycles panorama camera not working correct with speed

vectors and window texture coordinates. Only for Fisheye Equisolid it's
still not working correct yet. Patch from Dalai with modifications.

1 files changed, 207 insertions, 0 deletions

diff --git a/intern/cycles/kernel/kernel_projection.h b/intern/cycles/kernel/kernel_projection.h
new file mode 100644
index 00000000000..43535182d61
--- /dev/null
+++ b/intern/cycles/kernel/kernel_projection.h
@@ -0,0 +1,207 @@
+/*
+ * Parts adapted from Open Shading Language with this license:
+ *
+ * Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
+ * All Rights Reserved.
+ *
+ * Modifications Copyright 2011, Blender Foundation.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * * Neither the name of Sony Pictures Imageworks nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef __KERNEL_PROJECTION_CL__
+#define __KERNEL_PROJECTION_CL__
+
+CCL_NAMESPACE_BEGIN
+
+/* Spherical coordinates <-> Cartesian direction  */
+
+__device float2 direction_to_spherical(float3 dir)
+{
+	float theta = acosf(dir.z);
+	float phi = atan2f(dir.x, dir.y);
+
+	return make_float2(theta, phi);
+}
+
+__device float3 spherical_to_direction(float theta, float phi)
+{
+	return make_float3(
+		sinf(theta)*cosf(phi),
+		sinf(theta)*sinf(phi),
+		cosf(theta));
+}
+
+/* Equirectangular coordinates <-> Cartesian direction */
+
+__device float2 direction_to_equirectangular(float3 dir)
+{
+	float u = -atan2f(dir.y, dir.x)/(2.0f*M_PI_F) + 0.5f;
+	float v = atan2f(dir.z, hypotf(dir.x, dir.y))/M_PI_F + 0.5f;
+
+	return make_float2(u, v);
+}
+
+__device float3 equirectangular_to_direction(float u, float v)
+{
+	float phi = M_PI_F*(1.0f - 2.0f*u);
+	float theta = M_PI_F*(1.0f - v);
+
+	return make_float3(
+		sin(theta)*cos(phi),
+		sin(theta)*sin(phi),
+		cos(theta));
+}
+
+/* Fisheye <- Cartesian direction */
+
+__device float2 direction_to_fisheye(float3 dir, float fov)
+{
+	float r = atan2f(sqrt(dir.y*dir.y +  dir.z*dir.z), dir.x) / fov;
+	float phi = atan2(dir.z, dir.y);
+
+	float u = r * cos(phi) + 0.5f;
+	float v = r * sin(phi) + 0.5f;
+
+	return make_float2(u, v);
+}
+
+__device float3 fisheye_to_direction(float u, float v, float fov)
+{
+	u = (u - 0.5f) * 2.0f;
+	v = (v - 0.5f) * 2.0f;
+
+	float r = sqrt(u*u + v*v);
+
+	if(r > 1.0f)
+		return make_float3(0.0f, 0.0f, 0.0f);
+
+	float phi = acosf((r != 0.0f)? u/r: 0.0f);
+	float theta = asinf(r) * (fov / M_PI_F);
+
+	if(v < 0.0f) phi = -phi;
+
+	return make_float3(
+		 cosf(theta),
+		 -cosf(phi)*sinf(theta),
+		 sinf(phi)*sinf(theta)
+	);
+}
+
+__device float2 direction_to_fisheye_equisolid(float3 dir, float lens, float fov, float width, float height)
+{
+	/* XXX not implemented yet */
+	float u = -atan2f(dir.y, dir.x)/(2.0f*M_PI_F) + 0.5f;
+	float v = atan2f(dir.z, hypotf(dir.x, dir.y))/M_PI_F + 0.5f;
+
+	return make_float2(u, v);
+}
+
+__device float3 fisheye_equisolid_to_direction(float u, float v, float lens, float fov, float width, float height)
+{
+	u = (u - 0.5f) * width;
+	v = (v - 0.5f) * height;
+
+	float rmax = 2.0f * lens * sinf(fov * 0.25f);
+	float r = sqrt(u*u + v*v);
+
+	if(r > rmax)
+		return make_float3(0.0f, 0.0f, 0.0f);
+
+	float phi = acosf((r != 0.0f)? u/r: 0.0f);
+	float theta = 2.0f * asinf(r/(2.0f * lens));
+
+	if(v < 0.0f) phi = -phi;
+
+	return make_float3(
+		 cosf(theta),
+		 -cosf(phi)*sinf(theta),
+		 sinf(phi)*sinf(theta)
+	);
+}
+
+/* Mirror Ball <-> Cartesion direction */
+
+__device float3 mirrorball_to_direction(float u, float v)
+{
+	/* point on sphere */
+	float3 dir;
+
+	dir.x = 2.0f*u - 1.0f;
+	dir.z = 2.0f*v - 1.0f;
+	dir.y = -sqrt(max(1.0f - dir.x*dir.x - dir.z*dir.z, 0.0f));
+
+	/* reflection */
+	float3 I = make_float3(0.0f, -1.0f, 0.0f);
+
+	return 2.0f*dot(dir, I)*dir - I;
+}
+
+__device float2 direction_to_mirrorball(float3 dir)
+{
+	/* inverse of mirrorball_to_direction */
+	dir.y -= 1.0f;
+
+	float div = 2.0f*sqrt(max(-0.5f*dir.y, 0.0f));
+	if(div > 0.0f)
+		dir /= div;
+
+	float u = 0.5f*(dir.x + 1.0f);
+	float v = 0.5f*(dir.z + 1.0f);
+
+	return make_float2(u, v);
+}
+
+__device float3 panorama_to_direction(KernelGlobals *kg, float u, float v)
+{
+	switch(kernel_data.cam.panorama_type) {
+		case PANORAMA_EQUIRECTANGULAR:
+			return equirectangular_to_direction(u, v);
+		case PANORAMA_FISHEYE_EQUIDISTANT:
+			return fisheye_to_direction(u, v, kernel_data.cam.fisheye_fov);
+		case PANORAMA_FISHEYE_EQUISOLID:
+		default:
+			return fisheye_equisolid_to_direction(u, v, kernel_data.cam.fisheye_lens,
+				kernel_data.cam.fisheye_fov, kernel_data.cam.sensorwidth, kernel_data.cam.sensorheight);
+	}
+}
+
+__device float2 direction_to_panorama(KernelGlobals *kg, float3 dir)
+{
+	switch(kernel_data.cam.panorama_type) {
+		case PANORAMA_EQUIRECTANGULAR:
+			return direction_to_equirectangular(dir);
+		case PANORAMA_FISHEYE_EQUIDISTANT:
+			return direction_to_fisheye(dir, kernel_data.cam.fisheye_fov);
+		case PANORAMA_FISHEYE_EQUISOLID:
+		default:
+			return direction_to_fisheye_equisolid(dir, kernel_data.cam.fisheye_lens,
+				kernel_data.cam.fisheye_fov, kernel_data.cam.sensorwidth, kernel_data.cam.sensorheight);
+	}
+}
+
+CCL_NAMESPACE_END
+
+#endif /* __KERNEL_PROJECTION_CL__ */
+